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------------------------------------------------------------------------------

--                                                                          --

--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --

--                                                                          --

--                   S Y S T E M . O S _ I N T E R F A C E                  --

--                                                                          --

--                                  S p e c                                 --

--                                                                          --

--             Copyright (C) 1991-1994, Florida State University            --

--          Copyright (C) 1995-2008, Free Software Foundation, Inc.         --

--                                                                          --

-- GNARL is free software; you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNARL; see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNARL was developed by the GNARL team at Florida State University.       --

-- Extensive contributions were provided by Ada Core Technologies, Inc.     --

--                                                                          --

------------------------------------------------------------------------------

--  This is a OpenVMS/Alpha version of this package

--  This package encapsulates all direct interfaces to OS services

--  that are needed by the tasking run-time (libgnarl).

--  PLEASE DO NOT add any with-clauses to this package or remove the pragma

--  Preelaborate. This package is designed to be a bottom-level (leaf) package.

with Interfaces.C;

with Ada.Unchecked_Conversion;

with System.Aux_DEC;

package System.OS_Interface is

   pragma Preelaborate;

   pragma Linker_Options ("--for-linker=sys$library:pthread$rtl.exe");

   --  Link in the DEC threads library

   --  pragma Linker_Options ("--for-linker=/threads_enable");

   --  Enable upcalls and multiple kernel threads.

   subtype int            is Interfaces.C.int;

   subtype short          is Interfaces.C.short;

   subtype long           is Interfaces.C.long;

   subtype unsigned       is Interfaces.C.unsigned;

   subtype unsigned_short is Interfaces.C.unsigned_short;

   subtype unsigned_long  is Interfaces.C.unsigned_long;

   subtype unsigned_char  is Interfaces.C.unsigned_char;

   subtype plain_char     is Interfaces.C.plain_char;

   subtype size_t         is Interfaces.C.size_t;

   -----------------------------

   -- Signals (Interrupt IDs) --

   -----------------------------

   --  Type signal has an arbitrary limit of 31

   Max_Interrupt : constant := 31;

   type Signal is new unsigned range 0 .. Max_Interrupt;

   for Signal'Size use unsigned'Size;

   type sigset_t is array (Signal) of Boolean;

   pragma Pack (sigset_t);

   --  Interrupt_Number_Type

   --  Unsigned long integer denoting the number of an interrupt

   subtype Interrupt_Number_Type is unsigned_long;

   --  OpenVMS system services return values of type Cond_Value_Type

   subtype Cond_Value_Type is unsigned_long;

   subtype Short_Cond_Value_Type is unsigned_short;

   type IO_Status_Block_Type is record

      Status   : Short_Cond_Value_Type;

      Count    : unsigned_short;

      Dev_Info : unsigned_long;

   end record;

   type AST_Handler is access procedure (Param : Address);

   pragma Convention (C, AST_Handler);

   No_AST_Handler : constant AST_Handler := null;

   CMB_M_READONLY  : constant := 16#00000001#;

   CMB_M_WRITEONLY : constant := 16#00000002#;

   AGN_M_READONLY  : constant := 16#00000001#;

   AGN_M_WRITEONLY : constant := 16#00000002#;

   IO_WRITEVBLK : constant := 48;  --  WRITE VIRTUAL BLOCK

   IO_READVBLK  : constant := 49;  --  READ VIRTUAL BLOCK

   ----------------

   -- Sys_Assign --

   ----------------

   --

   --  Assign I/O Channel

   --

   --  Status = returned status

   --  Devnam = address  of  device  name  or  logical  name   string

   --               descriptor

   --  Chan   = address of word to receive channel number assigned

   --  Acmode = access mode associated with channel

   --  Mbxnam = address of mailbox logical name string descriptor, if

   --               mailbox associated with device

   --  Flags  = optional channel flags longword for specifying options

   --           for the $ASSIGN operation

   --

   procedure Sys_Assign

     (Status : out Cond_Value_Type;

      Devnam : String;

      Chan   : out unsigned_short;

      Acmode : unsigned_short := 0;

      Mbxnam : String := String'Null_Parameter;

      Flags  : unsigned_long := 0);

   pragma Interface (External, Sys_Assign);

   pragma Import_Valued_Procedure

     (Sys_Assign, "SYS$ASSIGN",

      (Cond_Value_Type, String,         unsigned_short,

       unsigned_short,  String,         unsigned_long),

      (Value,           Descriptor (s), Reference,

       Value,           Descriptor (s), Value),

      Flags);

   ----------------

   -- Sys_Cantim --

   ----------------

   --

   --  Cancel Timer

   --

   --  Status  = returned status

   --  Reqidt  = ID of timer to be cancelled

   --  Acmode  = Access mode

   --

   procedure Sys_Cantim

     (Status : out Cond_Value_Type;

      Reqidt : Address;

      Acmode : unsigned);

   pragma Interface (External, Sys_Cantim);

   pragma Import_Valued_Procedure

     (Sys_Cantim, "SYS$CANTIM",

      (Cond_Value_Type, Address, unsigned),

      (Value,           Value,   Value));

   ----------------

   -- Sys_Crembx --

   ----------------

   --

   --  Create mailbox

   --

   --     Status  = returned status

   --     Prmflg  = permanent flag

   --     Chan    = channel

   --     Maxmsg  = maximum message

   --     Bufquo  = buufer quote

   --     Promsk  = protection mast

   --     Acmode  = access mode

   --     Lognam  = logical name

   --     Flags   = flags

   --

   procedure Sys_Crembx

     (Status : out Cond_Value_Type;

      Prmflg : unsigned_char;

      Chan   : out unsigned_short;

      Maxmsg : unsigned_long := 0;

      Bufquo : unsigned_long := 0;

      Promsk : unsigned_short := 0;

      Acmode : unsigned_short := 0;

      Lognam : String;

      Flags  : unsigned_long := 0);

   pragma Interface (External, Sys_Crembx);

   pragma Import_Valued_Procedure

     (Sys_Crembx, "SYS$CREMBX",

      (Cond_Value_Type, unsigned_char,  unsigned_short,

       unsigned_long,   unsigned_long,  unsigned_short,

       unsigned_short,  String,         unsigned_long),

      (Value,           Value,          Reference,

       Value,           Value,          Value,

       Value,           Descriptor (s), Value));

   -------------

   -- Sys_QIO --

   -------------

   --

   --    Queue I/O

   --

   --     Status = Returned status of call

   --     EFN    = event flag to be set when I/O completes

   --     Chan   = channel

   --     Func   = function

   --     Iosb   = I/O status block

   --     Astadr = system trap to be generated when I/O completes

   --     Astprm = AST parameter

   --     P1-6   = optional parameters

   procedure Sys_QIO

     (Status : out Cond_Value_Type;

      EFN    : unsigned_long := 0;

      Chan   : unsigned_short;

      Func   : unsigned_long := 0;

      Iosb   : out IO_Status_Block_Type;

      Astadr : AST_Handler := No_AST_Handler;

      Astprm : Address := Null_Address;

      P1     : unsigned_long := 0;

      P2     : unsigned_long := 0;

      P3     : unsigned_long := 0;

      P4     : unsigned_long := 0;

      P5     : unsigned_long := 0;

      P6     : unsigned_long := 0);

   procedure Sys_QIO

     (Status : out Cond_Value_Type;

      EFN    : unsigned_long := 0;

      Chan   : unsigned_short;

      Func   : unsigned_long := 0;

      Iosb   : Address := Null_Address;

      Astadr : AST_Handler := No_AST_Handler;

      Astprm : Address := Null_Address;

      P1     : unsigned_long := 0;

      P2     : unsigned_long := 0;

      P3     : unsigned_long := 0;

      P4     : unsigned_long := 0;

      P5     : unsigned_long := 0;

      P6     : unsigned_long := 0);

   pragma Interface (External, Sys_QIO);

   pragma Import_Valued_Procedure

     (Sys_QIO, "SYS$QIO",

      (Cond_Value_Type,      unsigned_long, unsigned_short, unsigned_long,

       IO_Status_Block_Type, AST_Handler,   Address,

       unsigned_long,        unsigned_long, unsigned_long,

       unsigned_long,        unsigned_long, unsigned_long),

      (Value,                Value,         Value,          Value,

       Reference,            Value,         Value,

       Value,                Value,         Value,

       Value,                Value,         Value));

   pragma Import_Valued_Procedure

     (Sys_QIO, "SYS$QIO",

      (Cond_Value_Type, unsigned_long, unsigned_short, unsigned_long,

       Address,         AST_Handler,   Address,

       unsigned_long,   unsigned_long, unsigned_long,

       unsigned_long,   unsigned_long, unsigned_long),

      (Value,           Value,         Value,          Value,

       Value,           Value,         Value,

       Value,           Value,         Value,

       Value,           Value,         Value));

   ----------------

   -- Sys_Setimr --

   ----------------

   --

   --    Set Timer

   --

   --     Status = Returned status of call

   --     EFN    = event flag to be set when timer expires

   --     Tim    = expiration time

   --     AST    = system trap to be generated when timer expires

   --     Redidt = returned ID of timer (e.g. to cancel timer)

   --     Flags  = flags

   --

   procedure Sys_Setimr

     (Status : out Cond_Value_Type;

      EFN    : unsigned_long;

      Tim    : Long_Integer;

      AST    : AST_Handler;

      Reqidt : Address;

      Flags  : unsigned_long);

   pragma Interface (External, Sys_Setimr);

   pragma Import_Valued_Procedure

     (Sys_Setimr, "SYS$SETIMR",

      (Cond_Value_Type, unsigned_long,     Long_Integer,

       AST_Handler,     Address,           unsigned_long),

      (Value,           Value,             Reference,

       Value,           Value,             Value));

   Interrupt_ID_0   : constant  := 0;

   Interrupt_ID_1   : constant  := 1;

   Interrupt_ID_2   : constant  := 2;

   Interrupt_ID_3   : constant  := 3;

   Interrupt_ID_4   : constant  := 4;

   Interrupt_ID_5   : constant  := 5;

   Interrupt_ID_6   : constant  := 6;

   Interrupt_ID_7   : constant  := 7;

   Interrupt_ID_8   : constant  := 8;

   Interrupt_ID_9   : constant  := 9;

   Interrupt_ID_10  : constant  := 10;

   Interrupt_ID_11  : constant  := 11;

   Interrupt_ID_12  : constant  := 12;

   Interrupt_ID_13  : constant  := 13;

   Interrupt_ID_14  : constant  := 14;

   Interrupt_ID_15  : constant  := 15;

   Interrupt_ID_16  : constant  := 16;

   Interrupt_ID_17  : constant  := 17;

   Interrupt_ID_18  : constant  := 18;

   Interrupt_ID_19  : constant  := 19;

   Interrupt_ID_20  : constant  := 20;

   Interrupt_ID_21  : constant  := 21;

   Interrupt_ID_22  : constant  := 22;

   Interrupt_ID_23  : constant  := 23;

   Interrupt_ID_24  : constant  := 24;

   Interrupt_ID_25  : constant  := 25;

   Interrupt_ID_26  : constant  := 26;

   Interrupt_ID_27  : constant  := 27;

   Interrupt_ID_28  : constant  := 28;

   Interrupt_ID_29  : constant  := 29;

   Interrupt_ID_30  : constant  := 30;

   Interrupt_ID_31  : constant  := 31;

   -----------

   -- Errno --

   -----------

   function errno return int;

   pragma Import (C, errno, "__get_errno");

   EINTR  : constant := 4;   --  Interrupted system call

   EAGAIN : constant := 11;  --  No more processes

   ENOMEM : constant := 12;  --  Not enough core

   -------------------------

   -- Priority Scheduling --

   -------------------------

   SCHED_FIFO  : constant := 1;

   SCHED_RR    : constant := 2;

   SCHED_OTHER : constant := 3;

   SCHED_BG    : constant := 4;

   SCHED_LFI   : constant := 5;

   SCHED_LRR   : constant := 6;

   -------------

   -- Process --

   -------------

   type pid_t is private;

   function kill (pid : pid_t; sig : Signal) return int;

   pragma Import (C, kill);

   function getpid return pid_t;

   pragma Import (C, getpid);

   -------------

   -- Threads --

   -------------

   type Thread_Body is access

     function (arg : System.Address) return System.Address;

   pragma Convention (C, Thread_Body);

   function Thread_Body_Access is new

     Ada.Unchecked_Conversion (System.Aux_DEC.Short_Address, Thread_Body);

   type pthread_t           is private;

   subtype Thread_Id        is pthread_t;

   type pthread_mutex_t     is limited private;

   type pthread_cond_t      is limited private;

   type pthread_attr_t      is limited private;

   type pthread_mutexattr_t is limited private;

   type pthread_condattr_t  is limited private;

   type pthread_key_t       is private;

   PTHREAD_CREATE_JOINABLE     : constant := 0;

   PTHREAD_CREATE_DETACHED     : constant := 1;

   PTHREAD_CANCEL_DISABLE      : constant := 0;

   PTHREAD_CANCEL_ENABLE       : constant := 1;

   PTHREAD_CANCEL_DEFERRED     : constant := 0;

   PTHREAD_CANCEL_ASYNCHRONOUS : constant := 1;

   --  Don't use ERRORCHECK mutexes, they don't work when a thread is not

   --  the owner.  AST's, at least, unlock others threads mutexes. Even

   --  if the error is ignored, they don't work.

   PTHREAD_MUTEX_NORMAL_NP     : constant := 0;

   PTHREAD_MUTEX_RECURSIVE_NP  : constant := 1;

   PTHREAD_MUTEX_ERRORCHECK_NP : constant := 2;

   PTHREAD_INHERIT_SCHED       : constant := 0;

   PTHREAD_EXPLICIT_SCHED      : constant := 1;

   function pthread_cancel (thread : pthread_t) return int;

   pragma Import (C, pthread_cancel, "PTHREAD_CANCEL");

   procedure pthread_testcancel;

   pragma Import (C, pthread_testcancel, "PTHREAD_TESTCANCEL");

   function pthread_setcancelstate

     (newstate : int; oldstate : access int) return int;

   pragma Import (C, pthread_setcancelstate, "PTHREAD_SETCANCELSTATE");

   function pthread_setcanceltype

     (newtype : int; oldtype : access int) return int;

   pragma Import (C, pthread_setcanceltype, "PTHREAD_SETCANCELTYPE");

   -------------------------

   -- POSIX.1c  Section 3 --

   -------------------------

   function pthread_lock_global_np return int;

   pragma Import (C, pthread_lock_global_np, "PTHREAD_LOCK_GLOBAL_NP");

   function pthread_unlock_global_np return int;

   pragma Import (C, pthread_unlock_global_np, "PTHREAD_UNLOCK_GLOBAL_NP");

   --------------------------

   -- POSIX.1c  Section 11 --

   --------------------------

   function pthread_mutexattr_init

     (attr : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutexattr_init, "PTHREAD_MUTEXATTR_INIT");

   function pthread_mutexattr_destroy

     (attr : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutexattr_destroy, "PTHREAD_MUTEXATTR_DESTROY");

   function pthread_mutexattr_settype_np

     (attr      : access pthread_mutexattr_t;

      mutextype : int) return int;

   pragma Import (C, pthread_mutexattr_settype_np,

                     "PTHREAD_MUTEXATTR_SETTYPE_NP");

   function pthread_mutex_init

     (mutex : access pthread_mutex_t;

      attr  : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutex_init, "PTHREAD_MUTEX_INIT");

   function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_mutex_destroy, "PTHREAD_MUTEX_DESTROY");

   function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_mutex_lock, "PTHREAD_MUTEX_LOCK");

   function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_mutex_unlock, "PTHREAD_MUTEX_UNLOCK");

   function pthread_condattr_init

     (attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_condattr_init, "PTHREAD_CONDATTR_INIT");

   function pthread_condattr_destroy

     (attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_condattr_destroy, "PTHREAD_CONDATTR_DESTROY");

   function pthread_cond_init

     (cond : access pthread_cond_t;

      attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_cond_init, "PTHREAD_COND_INIT");

   function pthread_cond_destroy (cond : access pthread_cond_t) return int;

   pragma Import (C, pthread_cond_destroy, "PTHREAD_COND_DESTROY");

   function pthread_cond_signal (cond : access pthread_cond_t) return int;

   pragma Import (C, pthread_cond_signal, "PTHREAD_COND_SIGNAL");

   function pthread_cond_signal_int_np

     (cond : access pthread_cond_t) return int;

   pragma Import (C, pthread_cond_signal_int_np,

                  "PTHREAD_COND_SIGNAL_INT_NP");

   function pthread_cond_wait

     (cond  : access pthread_cond_t;

      mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_cond_wait, "PTHREAD_COND_WAIT");

   --------------------------

   -- POSIX.1c  Section 13 --

   --------------------------

   function pthread_mutexattr_setprotocol

     (attr : access pthread_mutexattr_t; protocol : int) return int;

   pragma Import (C, pthread_mutexattr_setprotocol,

                     "PTHREAD_MUTEXATTR_SETPROTOCOL");

   type struct_sched_param is record

      sched_priority : int;  --  scheduling priority

   end record;

   for struct_sched_param'Size use 8*4;

   pragma Convention (C, struct_sched_param);

   function pthread_setschedparam

     (thread : pthread_t;

      policy : int;

      param  : access struct_sched_param) return int;

   pragma Import (C, pthread_setschedparam, "PTHREAD_SETSCHEDPARAM");

   function pthread_attr_setscope

     (attr            : access pthread_attr_t;

      contentionscope : int) return int;

   pragma Import (C, pthread_attr_setscope, "PTHREAD_ATTR_SETSCOPE");

   function pthread_attr_setinheritsched

     (attr            : access pthread_attr_t;

      inheritsched : int) return int;

   pragma Import (C, pthread_attr_setinheritsched,

                     "PTHREAD_ATTR_SETINHERITSCHED");

   function pthread_attr_setschedpolicy

     (attr : access pthread_attr_t; policy : int) return int;

   pragma Import (C, pthread_attr_setschedpolicy,

                     "PTHREAD_ATTR_SETSCHEDPOLICY");

   function pthread_attr_setschedparam

     (attr        : access pthread_attr_t;

      sched_param : int) return int;

   pragma Import (C, pthread_attr_setschedparam, "PTHREAD_ATTR_SETSCHEDPARAM");

   function sched_yield return int;

   --------------------------

   -- P1003.1c  Section 16 --

   --------------------------

   function pthread_attr_init (attributes : access pthread_attr_t) return int;

   pragma Import (C, pthread_attr_init, "PTHREAD_ATTR_INIT");

   function pthread_attr_destroy

     (attributes : access pthread_attr_t) return int;

   pragma Import (C, pthread_attr_destroy, "PTHREAD_ATTR_DESTROY");

   function pthread_attr_setdetachstate

     (attr        : access pthread_attr_t;

      detachstate : int) return int;

   pragma Import (C, pthread_attr_setdetachstate,

                     "PTHREAD_ATTR_SETDETACHSTATE");

   function pthread_attr_setstacksize

     (attr      : access pthread_attr_t;

      stacksize : size_t) return int;

   pragma Import (C, pthread_attr_setstacksize, "PTHREAD_ATTR_SETSTACKSIZE");

   function pthread_create

     (thread        : access pthread_t;

      attributes    : access pthread_attr_t;

      start_routine : Thread_Body;

      arg           : System.Address) return int;

   pragma Import (C, pthread_create, "PTHREAD_CREATE");

   procedure pthread_exit (status : System.Address);

   pragma Import (C, pthread_exit, "PTHREAD_EXIT");

   function pthread_self return pthread_t;

   --------------------------

   -- POSIX.1c  Section 17 --

   --------------------------

   function pthread_setspecific

     (key   : pthread_key_t;

      value : System.Address) return  int;

   pragma Import (C, pthread_setspecific, "PTHREAD_SETSPECIFIC");

   function pthread_getspecific (key : pthread_key_t) return System.Address;

   pragma Import (C, pthread_getspecific, "PTHREAD_GETSPECIFIC");

   type destructor_pointer is access procedure (arg : System.Address);

   pragma Convention (C, destructor_pointer);

   function pthread_key_create

     (key        : access pthread_key_t;

      destructor : destructor_pointer) return int;

   pragma Import (C, pthread_key_create, "PTHREAD_KEY_CREATE");

private

   type pid_t is new int;

   type pthreadLongAddr_p is mod 2 ** Long_Integer'Size;

   type pthreadLongAddr_t is mod 2 ** Long_Integer'Size;

   type pthreadLongAddr_t_ptr is mod 2 ** Long_Integer'Size;

   type pthreadLongString_t is mod 2 ** Long_Integer'Size;

   type pthreadLongUint_t is mod 2 ** Long_Integer'Size;

   type pthreadLongUint_array is array (Natural range <>)

     of pthreadLongUint_t;

   type pthread_t is mod 2 ** Long_Integer'Size;

   type pthread_cond_t is record

      state    : unsigned;

      valid    : unsigned;

      name     : pthreadLongString_t;

      arg      : unsigned;

      sequence : unsigned;

      block    : pthreadLongAddr_t_ptr;

   end record;

   for pthread_cond_t'Size use 8*32;

   pragma Convention (C, pthread_cond_t);

   type pthread_attr_t is record

      valid    : long;

      name     : pthreadLongString_t;

      arg      : pthreadLongUint_t;

      reserved : pthreadLongUint_array (0 .. 18);

   end record;

   for pthread_attr_t'Size use 8*176;

   pragma Convention (C, pthread_attr_t);

   type pthread_mutex_t is record

      lock     : unsigned;

      valid    : unsigned;

      name     : pthreadLongString_t;

      arg      : unsigned;

      sequence : unsigned;

      block    : pthreadLongAddr_p;

      owner    : unsigned;

      depth    : unsigned;

   end record;

   for pthread_mutex_t'Size use 8*40;

   pragma Convention (C, pthread_mutex_t);

   type pthread_mutexattr_t is record

      valid    : long;

      reserved : pthreadLongUint_array (0 .. 14);

   end record;

   for pthread_mutexattr_t'Size use 8*128;

   pragma Convention (C, pthread_mutexattr_t);

   type pthread_condattr_t is record

      valid    : long;

      reserved : pthreadLongUint_array (0 .. 12);

   end record;

   for pthread_condattr_t'Size use 8*112;

   pragma Convention (C, pthread_condattr_t);

   type pthread_key_t is new unsigned;

   pragma Inline (pthread_self);

end System.OS_Interface;